A method for preparing bio-based phenolic compounds by catalyzing liquefied rice straw
A bio-based phenol and catalytic liquefaction technology, applied in the fields of environmental protection and bio-based chemicals, can solve problems such as hydrothermal liquefaction treatment that does not involve straw
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Embodiment 1
[0016] Using rice straw as raw material, first crush the rice straw, take 15 g of rice straw powder and pour it into a 250 mL high-pressure reactor, add 150 mL of deionized water and 2 g of activated copper-zinc-aluminum catalyst, stir to make a slurry, and pour into the reactor Filled with 1.2MPa H 2 , heated to 260°C while stirring, kept for 30 min, passed tap water to cool to room temperature, and poured out the reaction mixture. After the solid-liquid separation of the product, the solid phase product was extracted with 100 mL ethyl acetate, extracted and filtered; 10 mL of the aqueous phase product was extracted with 20 mL ethyl acetate, extracted and separated. The extracted phases were diluted and quantified respectively, and the extracted phases obtained by liquid separation were qualitatively and quantitatively analyzed for phenolic compounds by gas chromatography-mass spectrometry (GC-MS). The yield of phenolic compounds was 13.83% ( relative to the quality of ligni...
Embodiment 2
[0018] Using rice straw as raw material, first crush the rice straw, pour 15 g of rice straw powder into a 250 mL autoclave, add 75 mL of deionized water, 75 mL of ethanol and 2 g of activated copper-zinc-aluminum catalyst, stir to make a slurry , fill the reactor with 1.2 MPa H 2 , heated to 300°C while stirring, kept for 30 min, passed tap water to cool to room temperature, and poured out the reaction mixture. After the solid-liquid separation of the product, the solid phase product was extracted with 100 mL ethyl acetate, extracted and filtered; 10 mL of the aqueous phase product was extracted with 20 mL ethyl acetate, extracted and separated. The obtained extract phases were diluted and quantified respectively, and the extract phases obtained by liquid separation were qualitatively and quantitatively analyzed for phenolic compounds by gas chromatography-mass spectrometry (GC-MS). The yield of phenolic compounds was 28% ( relative to the quality of lignin in wood straw). ...
Embodiment 3
[0020] The solid residue obtained by the reaction was dried at 105°C, and the dried residue was put into a tube-type atmosphere furnace under air, 500 o C roasting for 1h; reactivate the roasted residue, use hydrogen to remove the air in the tube, the activation temperature is 300°C, the heating rate is 1°C / min, the hydrogen flow rate is kept at 60 mL / min, and the activation time is 2h . After the activation process is completed, wait for the temperature to cool down to room temperature and take it out. Using rice straw as raw material, first crush the rice straw, take 15 g rice straw powder and pour it into a 250 mL autoclave, add 75 mL deionized water, 75 mL ethanol and the solid residue after the activation of the above roasting, stir to make a slurry, and add Reactor filled with 1.2 MPa H 2 , heated to 300°C while stirring, kept for 30 min, passed tap water to cool to room temperature, and poured out the reaction mixture. After the solid-liquid separation of the product...
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